Hello I have a 1991 eight eight......that has a slight surge/chuggle at about 35 to 45.....steady speed or just a little worse going up a hill...rpm is below 2 grand......things eliminated tcc or trans problems......took it to a trans guy for a test drive....new plug wires from napa and plugs, fuel filter, air filter, map sensor, cam sensor, havnt replaced crank sensor, no codes, .....is this the coil pack doing this or the module??........it has the magnavox design coil is all one unit...............or do I just bite the bullet and try coil pack then module? sorry............3.8 engine vin code c Edited by: camel

 

ECG valve?

 

ok whats an ecg valve.......did you mean egr?..........the symptoms are when I go uphill it seems to go up the hill like I am varying the accelerator pedal twice every second producing the surges........steady up hill 35 to 42 or down hill light on the gas produces the slight jerky sensation like I am deliberately going from all slack taken out of drive train to coast side of slack.....well if it is egr I have no clue how to check that....its a digital one

 

Try a fuel filter. If that don't help, then a fuel pump.